Azzera filtri
Azzera filtri

Draw growing circles on a jpeg file.

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Ranjan Sonalkar
Ranjan Sonalkar il 20 Ott 2017
Commentato: Ranjan Sonalkar il 20 Ott 2017
I have read in a jpeg file of a floor map. Now I want to draw a circle on it of time-dependent radius, so that it appears to be growing with time. I used the function viscircles. At a later time I want to go to a different position within the image and start drawing a new circle. But viscircles draws a filled circle that is persistent. How can I plot new circles and make the earlier circle go away. I could use cla every time I want a new circle, but that would require me to display the background image again. That would add processing time.

Risposta accettata

Jan il 20 Ott 2017
Modificato: Jan il 20 Ott 2017
You can remove the object by the delete command:
image(rand(640, 480, 3) * 0.5);
h = viscircles([200, 200], 5);

Più risposte (1)

Geoff Hayes
Geoff Hayes il 20 Ott 2017
Ranjan - according to viscircles, if you do something similar to
hg = viscircles(ax,centers,radii)
then h is a handle to an hggroup object. As such, you should be able to hide these circles (if you wish by setting the Visible property to off, see hggroup properties) or you should be able to just delete this object
The following example illustrates this
hg = hggroup;
x = -2*pi:0.4:2*pi;
y = sin(x);
The sine curve is drawn and then we can delete is with


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